package com.tanhua.dubbo.server.api;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.PageUtil;
import cn.hutool.core.util.StrUtil;
import com.alibaba.dubbo.config.annotation.Service;
import com.mongodb.client.result.DeleteResult;
import com.tanhua.dubbo.server.enums.IdType;
import com.tanhua.dubbo.server.pojo.FollowUser;
import com.tanhua.dubbo.server.pojo.Video;
import com.tanhua.dubbo.server.service.IdService;
import com.tanhua.dubbo.server.vo.PageInfo;
import lombok.extern.slf4j.Slf4j;
import org.bson.types.ObjectId;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.ArrayList;
import java.util.List;

@Service(version = "1.0.0")
@Slf4j
public class VideoApiImpl implements VideoApi{

    @Autowired
    private IdService idService;

    @Autowired
    private MongoTemplate mongoTemplate;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    private static final String VIDEO_FOLLOW_USER_KEY_PREFIX = "VIDEO_FOLLOW_USER_";

    @Override
    public String saveVideo(Video video) {
        try {
            if (!ObjectUtil.isAllNotEmpty(video.getUserId(),video.getPicUrl(),video.getVideoUrl())){
                return null;
            }

            video.setId(new ObjectId());
            video.setVid(this.idService.createId(IdType.VIDEO));
            video.setCreated(System.currentTimeMillis());

            this.mongoTemplate.save(video);

            return video.getId().toHexString();
        } catch (Exception e) {
            log.error("小视频发布失败~ video="+video,e);
        }

        return null;
    }

    @Override
    public PageInfo<Video> queryVideoList(Long userId, Integer page, Integer pageSize) {
        PageInfo<Video> pageInfo = new PageInfo<>();
        pageInfo.setPageNum(page);
        pageInfo.setPageSize(pageSize);

        String redisKey = "QUANZI_VIDEO_RECOMMEND_"+userId;
        String redisData = redisTemplate.opsForValue().get(redisKey);

        List<Long> vids = new ArrayList<>();
        int recommendCount = 0;
        if(ObjectUtil.isNotEmpty(redisData)){
            String[] split = StrUtil.split(redisData, ",");
            int[] startEnd = PageUtil.transToStartEnd(page - 1, pageSize);
            int startIndex = startEnd[0];
            int endIndex = Math.min(startEnd[1],pageSize);

            for (int i = startIndex; i < endIndex; i++) {
                vids.add(Convert.toLong(split[i]));
            }
            recommendCount = vids.size();
        }

        if(CollUtil.isEmpty(vids)){

            //计算查询数据库之前查询了多少页
            int totalPage = PageUtil.totalPage(recommendCount, pageSize);

            PageRequest pageRequest = PageRequest.of(page-totalPage-1,pageSize,
                    Sort.by(Sort.Order.desc("created")));
            Query query = new Query().with(pageRequest);
            List<Video> videoList = this.mongoTemplate.find(query, Video.class);

            pageInfo.setRecords(videoList);
            return pageInfo;

        }

        Query query = Query.query(Criteria.where("vid").in(vids));
        List<Video> videoList = this.mongoTemplate.find(query, Video.class);

        pageInfo.setRecords(videoList);
        return pageInfo;
    }

    @Override
    public Video queryVideoById(String videoId) {
        return this.mongoTemplate.findById(new ObjectId(videoId),Video.class);
    }

    @Override
    public Boolean followUser(Long userId, Long followUserId) {
       if(!ObjectUtil.isAllNotEmpty(userId,followUserId)){
           return false;
       }

        try {
            if(this.isFollowUser(userId, followUserId)){
               return false;
            }

            FollowUser followUser = new FollowUser();
            followUser.setId(new ObjectId());
            followUser.setUserId(userId);
            followUser.setFollowUserId(followUserId);
            followUser.setCreated(System.currentTimeMillis());

            this.mongoTemplate.save(followUser);

            String redisKey = this.getVideoFollowUserKey(userId);
            String hashKey = String.valueOf(followUserId);
            this.redisTemplate.opsForHash().put(redisKey,hashKey,"1");

            return true;
        } catch (Exception e) {
            log.error("关注用户出错了~ ");
        }
        return false;
    }

    @Override
    public Boolean disFollowUser(Long userId, Long followUserId) {
        if(!ObjectUtil.isAllNotEmpty(userId,followUserId)){
            return false;
        }

        if(!this.isFollowUser(userId, followUserId)){
                return false;
        }

        Query query = Query.query(Criteria.where("userId").is(userId).
                and("followUserId").is(followUserId));
        DeleteResult result = this.mongoTemplate.remove(query, FollowUser.class);

        if (result.getDeletedCount()>0){
            String redisKey = this.getVideoFollowUserKey(userId);
            String hashKey = String.valueOf(followUserId);
            this.redisTemplate.opsForHash().delete(redisKey,hashKey);

            return true;
        }
        return false;
    }

    @Override
    public Boolean isFollowUser(Long userId, Long followUserId) {
        String redisKey = this.getVideoFollowUserKey(userId);
        String hashKey = String.valueOf(followUserId);
        return this.redisTemplate.opsForHash().hasKey(redisKey,hashKey);
    }

    private String getVideoFollowUserKey(Long userId) {
        return VIDEO_FOLLOW_USER_KEY_PREFIX + userId;
    }


}
